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Improving the performance of colloidal quantum-dot-sensitized solar cells

机译：改善胶体量子点敏化太阳能电池的性能

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摘要

Solar cells based on a mesoporous structure of TiO_2 and the polysulfide redox electrolyte were prepared by direct adsorption of colloidal CdSe quantum dot light absorbers onto the oxide without any particular linker. Several factors cooperate to improve the performance of quantum-dot-sensitized solar cells: an open structure of the wide bandgap electron collector, which facilitates a higher covering of the internal surface with the sensitizer, a surface passivation of TiO_2 to reduce recombination and improved counter electrode materials. As a result, solar cells of 1.83% efficiency under full 1 sun illumination intensity have been obtained. Despite a relatively large short circuit current (J_(sc) = 7.13 mA cm~(-2)) and open circuit voltage (V_(oc) = 0.53V), the colloidal quantum dot solar cell performance is still limited by a low fill factor of 0.50, which is believed to arise from charge transfer of photogenerated electrons to the aqueous electrolyte.
机译：通过将胶体CdSe量子点光吸收剂直接吸附在氧化物上而无需任何特定的连接基，即可制备出基于TiO_2介孔结构的太阳能电池和多硫化物氧化还原电解质。几个因素合作来改善量子点敏化太阳能电池的性能：宽带隙电子收集器的开放结构，有助于敏化剂对内表面的更高覆盖，TiO_2的表面钝化以减少重组，并提高抗化学性电极材料。结果，获得了在全1太阳光照强度下效率为1.83％的太阳能电池。尽管有相对较大的短路电流（J_（sc）= 7.13 mA cm〜（-2））和开路电压（V_（oc）= 0.53V），但胶体量子点太阳能电池的性能仍然受填充率低的限制系数为0.50，这被认为是由于光生电子向水电解质的电荷转移而产生的。

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